Depending on your OS and Mercurial root certificate configuration you may get a warning message about the host certificate when communicating with the central repository. If that happens, ​you can remove those warnings by adding the following to your configuration file:

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Depending on your OS and Mercurial root certificate configuration you may get a warning message about the host certificate when communicating with the central repository. If that happens, ​please see [[https://www.mercurial-scm.org/​wiki/​CACertificates#​Configuration_of_HTTPS_certificate_authorities|the instructions on the Mercurial wiki]].

Note that these fingerprints will only be valid until the certificates expire (dvcs.w3.org expires 03-may-2016,​ hg.csswg.org expires expires 09-apr-2018). You will need to update the fingerprints when new certificates are issued.

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Alternatively (and better if you're on an OS where this is easy), you can avoid ever having to add fingerprints by following ​[[http://​mercurial.selenic.com/​wiki/​CACertificates#​Configuration_of_HTTPS_certificate_authorities|the instructions on the Mercurial wiki]].